nether/init.lua

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-- Parameters
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local NETHER_DEPTH = -5000
local TCAVE = 0.6
local BLEND = 128
-- 3D noise
local np_cave = {
offset = 0,
scale = 1,
spread = {x = 384, y = 128, z = 384}, -- squashed 3:1
seed = 59033,
octaves = 5,
persist = 0.7
}
-- Stuff
local yblmax = NETHER_DEPTH - BLEND * 2
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-- Functions
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local function build_portal(pos, target)
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local p1 = {x = pos.x - 1, y = pos.y - 1, z = pos.z}
local p2 = {x = p1.x + 3, y = p1.y + 4, z = p1.z}
local path = minetest.get_modpath("nether") .. "/schematics/nether_portal.mts"
minetest.place_schematic({x = p1.x, y = p1.y, z = p1.z - 2}, path, 0, nil, true)
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for y = p1.y, p2.y do
for x = p1.x, p2.x do
local meta = minetest.get_meta({x = x, y = y, z = p1.z})
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meta:set_string("p1", minetest.pos_to_string(p1))
meta:set_string("p2", minetest.pos_to_string(p2))
meta:set_string("target", minetest.pos_to_string(target))
end
end
end
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local function volume_is_natural(minp, maxp)
local c_air = minetest.get_content_id("air")
local c_ignore = minetest.get_content_id("ignore")
local vm = minetest.get_voxel_manip()
local pos1 = {x = minp.x, y = minp.y, z = minp.z}
local pos2 = {x = maxp.x, y = maxp.y, z = maxp.z}
local emin, emax = vm:read_from_map(pos1, pos2)
local area = VoxelArea:new({MinEdge = emin, MaxEdge = emax})
local data = vm:get_data()
for z = pos1.z, pos2.z do
for y = pos1.y, pos2.y do
local vi = area:index(pos1.x, y, z)
for x = pos1.x, pos2.x do
local id = data[vi] -- Existing node
if id ~= c_air and id ~= c_ignore then -- These are natural
local name = minetest.get_name_from_content_id(id)
if not minetest.registered_nodes[name].is_ground_content then
return false
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end
end
vi = vi + 1
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end
end
end
return true
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end
local function find_nether_target_y(target_x, target_z, start_y)
local nobj_cave_point = minetest.get_perlin(np_cave)
local air = 0 -- Consecutive air nodes found
for y = start_y, start_y - 4096, -1 do
local nval_cave = nobj_cave_point:get3d({x = target_x, y = y, z = target_z})
if nval_cave > TCAVE then -- Cavern
air = air + 1
else -- Not cavern, check if 4 nodes of space above
if air >= 4 then
-- Check volume for non-natural nodes
local minp = {x = target_x - 1, y = y - 1, z = target_z - 2}
local maxp = {x = target_x + 2, y = y + 3, z = target_z + 2}
if volume_is_natural(minp, maxp) then
return y + 2
else -- Restart search a little lower
find_nether_target_y(target_x, target_z, y - 16)
end
else -- Not enough space, reset air to zero
air = 0
end
end
end
return start_y -- Fallback
end
local function find_surface_target_y(target_x, target_z, start_y)
for y = start_y, start_y - 256, -16 do
-- Check volume for non-natural nodes
local minp = {x = target_x - 1, y = y - 1, z = target_z - 2}
local maxp = {x = target_x + 2, y = y + 3, z = target_z + 2}
if volume_is_natural(minp, maxp) then
return y
end
end
return y -- Fallback
end
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local function move_check(p1, max, dir)
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local p = {x = p1.x, y = p1.y, z = p1.z}
local d = math.abs(max - p1[dir]) / (max - p1[dir])
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while p[dir] ~= max do
p[dir] = p[dir] + d
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if minetest.get_node(p).name ~= "default:obsidian" then
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return false
end
end
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return true
end
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local function check_portal(p1, p2)
if p1.x ~= p2.x then
if not move_check(p1, p2.x, "x") then
return false
end
if not move_check(p2, p1.x, "x") then
return false
end
elseif p1.z ~= p2.z then
if not move_check(p1, p2.z, "z") then
return false
end
if not move_check(p2, p1.z, "z") then
return false
end
else
return false
end
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if not move_check(p1, p2.y, "y") then
return false
end
if not move_check(p2, p1.y, "y") then
return false
end
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return true
end
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local function is_portal(pos)
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for d = -3, 3 do
for y = -4, 4 do
local px = {x = pos.x + d, y = pos.y + y, z = pos.z}
local pz = {x = pos.x, y = pos.y + y, z = pos.z + d}
if check_portal(px, {x = px.x + 3, y = px.y + 4, z = px.z}) then
return px, {x = px.x + 3, y = px.y + 4, z = px.z}
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end
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if check_portal(pz, {x = pz.x, y = pz.y + 4, z = pz.z + 3}) then
return pz, {x = pz.x, y = pz.y + 4, z = pz.z + 3}
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end
end
end
end
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local function make_portal(pos)
local p1, p2 = is_portal(pos)
if not p1 or not p2 then
return false
end
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for d = 1, 2 do
for y = p1.y + 1, p2.y - 1 do
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local p
if p1.z == p2.z then
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p = {x = p1.x + d, y = y, z = p1.z}
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else
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p = {x = p1.x, y = y, z = p1.z + d}
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end
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if minetest.get_node(p).name ~= "air" then
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return false
end
end
end
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local param2
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if p1.z == p2.z then
param2 = 0
else
param2 = 1
end
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local target = {x = p1.x, y = p1.y, z = p1.z}
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target.x = target.x + 1
if target.y < NETHER_DEPTH then
target.y = find_surface_target_y(target.x, target.z, -16)
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else
local start_y = NETHER_DEPTH - math.random(500, 1500) -- Search start
target.y = find_nether_target_y(target.x, target.z, start_y)
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end
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for d = 0, 3 do
for y = p1.y, p2.y do
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local p = {}
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if param2 == 0 then
p = {x = p1.x + d, y = y, z = p1.z}
else
p = {x = p1.x, y = y, z = p1.z + d}
end
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if minetest.get_node(p).name == "air" then
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minetest.set_node(p, {name = "nether:portal", param2 = param2})
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end
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local meta = minetest.get_meta(p)
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meta:set_string("p1", minetest.pos_to_string(p1))
meta:set_string("p2", minetest.pos_to_string(p2))
meta:set_string("target", minetest.pos_to_string(target))
end
end
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return true
end
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-- ABMs
minetest.register_abm({
nodenames = {"nether:portal"},
interval = 1,
chance = 2,
action = function(pos, node)
minetest.add_particlespawner(
32, --amount
4, --time
{x = pos.x - 0.25, y = pos.y - 0.25, z = pos.z - 0.25}, --minpos
{x = pos.x + 0.25, y = pos.y + 0.25, z = pos.z + 0.25}, --maxpos
{x = -0.8, y = -0.8, z = -0.8}, --minvel
{x = 0.8, y = 0.8, z = 0.8}, --maxvel
{x = 0, y = 0, z = 0}, --minacc
{x = 0, y = 0, z = 0}, --maxacc
0.5, --minexptime
1, --maxexptime
1, --minsize
2, --maxsize
false, --collisiondetection
"nether_particle.png" --texture
)
for _, obj in ipairs(minetest.get_objects_inside_radius(pos, 1)) do
if obj:is_player() then
local meta = minetest.get_meta(pos)
local target = minetest.string_to_pos(meta:get_string("target"))
if target then
-- force emerge of target area
minetest.get_voxel_manip():read_from_map(target, target)
if not minetest.get_node_or_nil(target) then
minetest.emerge_area(
vector.subtract(target, 4), vector.add(target, 4))
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end
-- teleport the player
minetest.after(3, function(obj, pos, target)
local objpos = obj:getpos()
objpos.y = objpos.y + 0.1 -- Fix some glitches at -8000
if minetest.get_node(objpos).name ~= "nether:portal" then
return
end
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obj:setpos(target)
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local function check_and_build_portal(pos, target)
local n = minetest.get_node_or_nil(target)
if n and n.name ~= "nether:portal" then
build_portal(target, pos)
minetest.after(2, check_and_build_portal, pos, target)
minetest.after(4, check_and_build_portal, pos, target)
elseif not n then
minetest.after(1, check_and_build_portal, pos, target)
end
end
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minetest.after(1, check_and_build_portal, pos, target)
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end, obj, pos, target)
end
end
end
end,
})
-- Nodes
minetest.register_node("nether:portal", {
description = "Nether Portal",
tiles = {
"nether_transparent.png",
"nether_transparent.png",
"nether_transparent.png",
"nether_transparent.png",
{
name = "nether_portal.png",
animation = {
type = "vertical_frames",
aspect_w = 16,
aspect_h = 16,
length = 0.5,
},
},
{
name = "nether_portal.png",
animation = {
type = "vertical_frames",
aspect_w = 16,
aspect_h = 16,
length = 0.5,
},
},
},
drawtype = "nodebox",
paramtype = "light",
paramtype2 = "facedir",
sunlight_propagates = true,
use_texture_alpha = true,
walkable = false,
diggable = false,
pointable = false,
buildable_to = false,
is_ground_content = false,
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drop = "",
light_source = 5,
post_effect_color = {a = 180, r = 128, g = 0, b = 128},
alpha = 192,
node_box = {
type = "fixed",
fixed = {
{-0.5, -0.5, -0.1, 0.5, 0.5, 0.1},
},
},
groups = {not_in_creative_inventory = 1}
})
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minetest.register_node(":default:obsidian", {
description = "Obsidian",
tiles = {"default_obsidian.png"},
is_ground_content = false,
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sounds = default.node_sound_stone_defaults(),
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groups = {cracky = 1, level = 2},
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on_destruct = function(pos)
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local meta = minetest.get_meta(pos)
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local p1 = minetest.string_to_pos(meta:get_string("p1"))
local p2 = minetest.string_to_pos(meta:get_string("p2"))
local target = minetest.string_to_pos(meta:get_string("target"))
if not p1 or not p2 then
return
end
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for x = p1.x, p2.x do
for y = p1.y, p2.y do
for z = p1.z, p2.z do
local nn = minetest.get_node({x = x, y = y, z = z}).name
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if nn == "default:obsidian" or nn == "nether:portal" then
if nn == "nether:portal" then
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minetest.remove_node({x = x, y = y, z = z})
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end
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local m = minetest.get_meta({x = x, y = y, z = z})
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m:set_string("p1", "")
m:set_string("p2", "")
m:set_string("target", "")
end
end
end
end
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meta = minetest.get_meta(target)
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if not meta then
return
end
p1 = minetest.string_to_pos(meta:get_string("p1"))
p2 = minetest.string_to_pos(meta:get_string("p2"))
if not p1 or not p2 then
return
end
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for x = p1.x, p2.x do
for y = p1.y, p2.y do
for z = p1.z, p2.z do
local nn = minetest.get_node({x = x, y = y, z = z}).name
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if nn == "default:obsidian" or nn == "nether:portal" then
if nn == "nether:portal" then
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minetest.remove_node({x = x, y = y, z = z})
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end
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local m = minetest.get_meta({x = x, y = y, z = z})
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m:set_string("p1", "")
m:set_string("p2", "")
m:set_string("target", "")
end
end
end
end
end,
})
minetest.register_node("nether:rack", {
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description = "Netherrack",
tiles = {"nether_rack.png"},
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is_ground_content = true,
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groups = {cracky = 3, level = 2},
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sounds = default.node_sound_stone_defaults(),
})
minetest.register_node("nether:sand", {
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description = "Nethersand",
tiles = {"nether_sand.png"},
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is_ground_content = true,
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groups = {crumbly = 3, level = 2, falling_node = 1},
sounds = default.node_sound_gravel_defaults({
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footstep = {name = "default_gravel_footstep", gain = 0.45},
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}),
})
minetest.register_node("nether:glowstone", {
description = "Glowstone",
tiles = {"nether_glowstone.png"},
is_ground_content = true,
light_source = 14,
paramtype = "light",
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groups = {cracky = 3, oddly_breakable_by_hand = 3},
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sounds = default.node_sound_glass_defaults(),
})
minetest.register_node("nether:brick", {
description = "Nether Brick",
tiles = {"nether_brick.png"},
is_ground_content = false,
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groups = {cracky = 2, level = 2},
sounds = default.node_sound_stone_defaults(),
})
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local fence_texture =
"default_fence_overlay.png^nether_brick.png^default_fence_overlay.png^[makealpha:255,126,126"
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minetest.register_node("nether:fence_nether_brick", {
description = "Nether Brick Fence",
drawtype = "fencelike",
tiles = {"nether_brick.png"},
inventory_image = fence_texture,
wield_image = fence_texture,
paramtype = "light",
sunlight_propagates = true,
is_ground_content = false,
selection_box = {
type = "fixed",
fixed = {-1/7, -1/2, -1/7, 1/7, 1/2, 1/7},
},
groups = {cracky = 2, level = 2},
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sounds = default.node_sound_stone_defaults(),
})
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-- Register stair and slab
stairs.register_stair_and_slab(
"nether_brick",
"nether:brick",
{cracky = 2, level = 2},
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{"nether_brick.png"},
"nether stair",
"nether slab",
default.node_sound_stone_defaults()
)
-- Craftitems
minetest.register_craftitem(":default:mese_crystal_fragment", {
description = "Mese Crystal Fragment",
inventory_image = "default_mese_crystal_fragment.png",
on_place = function(stack, _, pt)
if pt.under and minetest.get_node(pt.under).name == "default:obsidian" then
local done = make_portal(pt.under)
if done and not minetest.setting_getbool("creative_mode") then
stack:take_item()
end
end
return stack
end,
})
-- Crafting
minetest.register_craft({
output = "nether:brick 4",
recipe = {
{"nether:rack", "nether:rack"},
{"nether:rack", "nether:rack"},
}
})
minetest.register_craft({
output = "nether:fence_nether_brick 6",
recipe = {
{"nether:brick", "nether:brick", "nether:brick"},
{"nether:brick", "nether:brick", "nether:brick"},
},
})
-- Mapgen
-- Initialize noise object and localise noise buffer
local nobj_cave = nil
local nbuf_cave
-- Content ids
local c_air = minetest.get_content_id("air")
local c_stone_with_coal = minetest.get_content_id("default:stone_with_coal")
local c_stone_with_iron = minetest.get_content_id("default:stone_with_iron")
local c_stone_with_mese = minetest.get_content_id("default:stone_with_mese")
local c_stone_with_diamond = minetest.get_content_id("default:stone_with_diamond")
local c_stone_with_gold = minetest.get_content_id("default:stone_with_gold")
local c_stone_with_copper = minetest.get_content_id("default:stone_with_copper")
local c_mese = minetest.get_content_id("default:mese")
local c_gravel = minetest.get_content_id("default:gravel")
local c_dirt = minetest.get_content_id("default:dirt")
local c_sand = minetest.get_content_id("default:sand")
local c_cobble = minetest.get_content_id("default:cobble")
local c_mossycobble = minetest.get_content_id("default:mossycobble")
local c_stair_cobble = minetest.get_content_id("stairs:stair_cobble")
local c_lava_source = minetest.get_content_id("default:lava_source")
local c_lava_flowing = minetest.get_content_id("default:lava_flowing")
local c_water_source = minetest.get_content_id("default:water_source")
local c_water_flowing = minetest.get_content_id("default:water_flowing")
local c_glowstone = minetest.get_content_id("nether:glowstone")
local c_nethersand = minetest.get_content_id("nether:sand")
local c_netherbrick = minetest.get_content_id("nether:brick")
local c_netherrack = minetest.get_content_id("nether:rack")
-- On-generated function
minetest.register_on_generated(function(minp, maxp, seed)
if minp.y > NETHER_DEPTH then
return
end
local t1 = os.clock()
local x1 = maxp.x
local y1 = maxp.y
local z1 = maxp.z
local x0 = minp.x
local y0 = minp.y
local z0 = minp.z
local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
local area = VoxelArea:new{MinEdge = emin, MaxEdge = emax}
local data = vm:get_data()
local x11 = emax.x -- Limits of mapchunk plus mapblock shell
local y11 = emax.y
local z11 = emax.z
local x00 = emin.x
local y00 = emin.y
local z00 = emin.z
local ystride = x1 - x0 + 1
local zstride = ystride * ystride
local chulens = {x = ystride, y = ystride, z = ystride}
local minposxyz = {x = x0, y = y0, z = z0}
nobj_cave = nobj_cave or minetest.get_perlin_map(np_cave, chulens)
local nvals_cave = nobj_cave:get3dMap_flat(minposxyz, nbuf_cave)
for y = y00, y11 do -- Y loop first to minimise tcave calculations
local tcave
local in_chunk_y = false
if y >= y0 and y <= y1 then
if y > yblmax then
tcave = TCAVE + ((y - yblmax) / BLEND) ^ 2
else
tcave = TCAVE
end
in_chunk_y = true
end
for z = z00, z11 do
local vi = area:index(x00, y, z) -- Initial voxelmanip index
local ni
local in_chunk_yz = in_chunk_y and z >= z0 and z <= z1
for x = x00, x11 do
if in_chunk_yz and x == x0 then
-- Initial noisemap index
ni = (z - z0) * zstride + (y - y0) * ystride + 1
end
local in_chunk_yzx = in_chunk_yz and x >= x0 and x <= x1 -- In mapchunk
local id = data[vi] -- Existing node
-- Cave air, cave liquids and dungeons are overgenerated,
-- convert these throughout mapchunk plus shell
if id == c_air or -- Air and liquids to air
id == c_lava_source or
id == c_lava_flowing or
id == c_water_source or
id == c_water_flowing then
data[vi] = c_air
-- Dungeons are preserved so we don't need
-- to check for cavern in the shell
elseif id == c_cobble or -- Dungeons (preserved) to netherbrick
id == c_mossycobble or
id == c_stair_cobble then
data[vi] = c_netherbrick
end
if in_chunk_yzx then -- In mapchunk
if nvals_cave[ni] > tcave then -- Only excavate cavern in mapchunk
data[vi] = c_air
elseif id == c_mese then -- Mese block to lava
data[vi] = c_lava_source
elseif id == c_stone_with_gold or -- Precious ores to glowstone
id == c_stone_with_mese or
id == c_stone_with_diamond then
data[vi] = c_glowstone
elseif id == c_gravel or -- Blob ore to nethersand
id == c_dirt or
id == c_sand then
data[vi] = c_nethersand
else -- All else to netherstone
data[vi] = c_netherrack
end
ni = ni + 1 -- Only increment noise index in mapchunk
end
vi = vi + 1
end
end
2013-04-29 20:33:09 +02:00
end
vm:set_data(data)
vm:set_lighting({day = 0, night = 0})
vm:calc_lighting()
vm:update_liquids()
vm:write_to_map()
local chugent = math.ceil((os.clock() - t1) * 1000)
print ("[nether] generate chunk " .. chugent .. " ms")
end)